@mmetwally: "Dears,,,
How - using Exchange 2003- to manage two mail domains like (xxx.msft) and 
(yyy.msft) Via the same exchange server ( I Have only one Server)
Also, I want to make my server is only backup mailserver for the mailserver 
that are hosted on the ISP server, in which when a message delivered to 
mailserver , a backup of it (copy) will be sent to my Exchange server that 
is in my LAN, either just it arrives or make a schedule to download all 
these messages to my Local Exchange server so, all my users will be 
connected to the local Mailserver to get their mailbox messages.
Thank U "
    @imaneophyte: "If you are talking about sharing SMTP address space, read this:
<url>
Nue
"Sanford Whiteman" <email_address> wrote in message 
news:<email_address>
<quote>"
    @sandy: "<quote>
That's not applicable given the OP's intended implementation.  The
address space isn't shared, because the MX does not receive any
messages back from the mailbox server.  The flow is unidirectional,
and it's thus acceptable for Exchange to consider itself the sole
authority for each domain.
Sandy"
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